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Finding the Fourth Proportional to 10.78, 16.15 and 9.28

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Solution

The fourth proportional to 10.78, 16.15 and 9.28 is: 13.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.78 : 16.15 = 9.28 : x
  2. Step 2: Convert to fraction form
    10.78/16.15 = 9.28/x
  3. Step 3: Cross multiply
    10.78x = 16.15 × 9.28
  4. Step 4: Simplify right side
    10.78x = 149.87
  5. Step 5: Solve for x
    x = 149.87/10.78
  6. Step 6: Final answer
    x = 13.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.